A communication apparatus at a client side communicates with a server to update remote one-touch keys each time because a remote one-touch key can be deleted or added in a communication apparatus at the server side. However, a remote one-touch key selected to specify a transmission destination can be used to deselect the transmission destination. Consequently, the communication apparatus at the client side does not update the remote one-touch keys while the remote one-touch key is selected to specify the transmission destination. With the configuration, the one-touch keys provided from the communication apparatus at the server side can be used while the operability of the one-touch keys is maintained.